使用node.js在Mongo中按Id删除子文档

Question

我正在使用 nodejs、express、mongo 和 coffeescript，我有一篇关于 cmets 的简单博客文章，我想添加在任何给定时间删除特定评论的可能性。架构如下所示：

Schema = mongoose.Schema

ArticleSchema = new Schema
  title:
    type: String
    trim: true
    required: true

  body:
    type: String
    required: true

  createdAt:
    type: Date
    default: Date.now

  comments: [
    body:
      type: String
      default : ''

    user:
      type: Schema.ObjectId
      ref: 'User'
      required: true

    createdAt:
      type: Date
      default: Date.now
  ]

文章的路线映射如下：

 articles = require '../app/controllers/articles'
 app.get '/', articles.index
 app.get '/articles', articles.manage
 app.get '/articles/new', auth.requiresLogin, articles.new
 app.get '/articles/:articleId', articles.show
 app.get '/articles/:articleId/edit', auth.requiresLogin, articles.edit

 app.param 'articleId', articles.article

但是我该如何做这样的事情才能删除评论呢？

  app.get '/articles/:articleId/comment/:commentId/delete', auth.requiresLogin, articles.edit

Answer 1

如果你的意思是你应该如何实现删除评论：你首先使用articleId检索文章文档，然后你可以找到并删除子文档：

// find article
...

// find the comment by id, and remove it:
article.comments.id(commentId).remove();

// since it's a sub-document of article, you need
// to save the article back to the database to
// 'finalize' the removal of the comment:
article.save(function(err) { ... });